Method of removing frequency modulation from amplitude...

Details Method of removing frequency modulation from amplitude... Method of removing frequency modulation from amplitude...

H - Electricity

04

B

H04B 10/18 (2006.01) H01S 5/50 (2006.01) H04B 10/145 (2006.01) H04B 10/155 (2006.01) H01S 5/06 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2111642

ABSTRACT A laser device, if directly amplitude modulated, exhibits an unwanted frequency modulation which broadens its emission spectrum. The unwanted frequency modulation is eliminated by carrying out a conversion of the modulated optical signal wavelength, using a semiconductor optical amplifier as a converter and another nonmodulated laser as a conversion signal generator. Wavelength conversion takes place in the amplifier due to gain modulation induced by saturation. An output signal at the conversion signal frequency, taken from a filter following the converter, presents an amplitude modulation equal and opposite to that of the modulated signal at input, but does not show frequency modulation.

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